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Classification of standard alleles of the MN blood group system
A Akane1, H Mizukami, H Shiono
1Department of Legal Medicine, Kansai Medical University, Moriguchi, Japan. akane@takii.kmu.ac.jp
Background And Objectives:
We had classified the M alleles of the MN blood group system into two subtypes, M(G) (standard M) and M(T), based on a G/T substitution in intron 1 of the glycophorin A (GPA) gene. This study provides further study on nucleotide sequences of M(G), M(T) and N alleles to profile the new allele, M(T).
Materials And Methods:
M(G), M(T) and N alleles of the GPA gene were amplified using GPA gene-specific primers to avoid co-amplification of the genes of glycophorins B and E. Then the 5'-flanking region, exons 1-7 and introns 1-4 of the alleles were analyzed by DNA sequencing.
Results:
There were 17 nucleotide substitutions and deletions between M(G) (standard M) and N alleles. Ten of the M(T) nucleotides were M(G)-type but the other 7 were N-type. M(T) allele also showed one base change and one deletion that were observed in neither the M(G) nor the N allele. Moreover, we found nucleotide substitutions within each allele, allowing further classification of the alleles.
Conclusion:
By the sequence data of M(G), M(T) and N alleles, the three alleles could be further classified into M101 and M102, M201 and M202, and N101 and N102, respectively.